Memory is derived from “cyclic memory,” meaning that a nickel-cadmium battery could remember how much energy was drawn on previous discharges and would not deliver more than was demanded before. On a discharge beyond regular duty, the voltage would abruptly drop as if to rebel against pending overtime. Improvements in battery technology have virtually eliminated the phenomenon of cycling memory. Figure 1 illustrates the stages of crystalline formation that occur on a nickel-cadmium cell if overcharged and not maintained with periodic deep discharges.
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